Improvement in flour-bolts



J. H. DeFORCE. H. H. HURD & G. SIMPSON.

FLOUR BOLTS. No. 178,276. Patented June 6,1876.

it may es W r @Z' ZZZ $21, z r 7 flway 76 NJ'ETE Hv PHOTO-LITHOGRAPHER WASH! GTON D C UNITED ra'rns JOHN H. DE FORCE, HENRY H, HURD, AND GEORGE SIMPSON, OF REDWOOD CITY, CALIFORNIA.

IMPROVEMENT lN FLOUR=BOLTS.

Specification forming part of Letters Patent No. 178.2176, dated June 6, 1876 application filed April 3, 1876.

To all whom it may concern:

Be it known that we, JoHN H. DE FORCE, HENRY H. Evan, and GEORGE SIMPsoN, of Redwood city, San Mateo county, State of Ualifornia, have invented an Improved Flourflour-cooling attachment to grist-mills.

Our improvement consists in a combination of devices for forcing one or more currents of fresh air into the flour-bolt or bolt-chest in which the flour is bolted, thus not only cooling the bolt-chest and flour, but serving also to prevent the interstices of the bolt-cloth from becoming clogged, and the bolt-chest from sweating.

in order to more fully illustrate and explain our invention reference is had to the accompanying drawing, in which Figure l is a perspective view of our invention.

Let A represent the bolt-chest, and B the belt, of a grist-mill. In order to cool the flour we direct a current of air either into the bolt itself or into the bolt-chest.

1n the presentinstance we have represented a stack or flue, c, which will project upward through the roof of the mill, and in which suitable openings D are made to admit air. This flue could, however, pass through the side of the mill if desired, the object being to secure a supply of fresh cool air from the outside atmosphere. This flue or stack we then connect with the bolt or bolt-chest by a pipe or tube, l as shown. At some suitable point in the length of the pipe or tube F we place a blower, G, which will draw air in through the openings in the flue or stack, and force itin a current through the tube or pipe into the bolt or bolt-chest.

lVe prefer, as represented in the drawings, to force the air into the bolt, so that the flour, as it is agitated by the rotation of the bolt,

will be subjected to the cooling effects of the bolting-surface.

We have represented a fan-blower, but it is evident that any suitable blowing apparatus can be used. The blower is driven by a beltconnection with the running-gear of the mill.

One or more dampers, h. can be used in the length of the pipe or tube F for the purpose of regulating the quantity of air to be forced into the bolt or bolt-chest. Branch pipes could also be applied for leading a portion of the air to other bolts or bolt-chests; but these devices will readily suggest themselves to the experienced mill-man.

We cool the flour by our process without any additional machinery, except the blower and air-pipe or tube, which become a stationary part of the mill.

Having thus described our invention, what we claim, and desire to secure by Letters Patent is The stack or flue O, with its openings D, the air pipe or tube 15, with its damper h, and the blower F, in combination with the bolt B or bolt-chest A of a? grist-mill, substantially as and for the purpose described.

JOHN H. DE FORGE. HENRY HULIN G HURD. GEO. SIMPSON. Witnesses:

B. It. BOYNTON, W. R. THOMAS. 

